Nicole Delien suffers from what's known as "Sleeping Beauty Syndrome," or Kleine-Levin Syndrome, a rare condition that causes her to sleep 18 to 19 hours a day and leaves her in a sleepwalking state when she’s awake, The Daily Mail reported.

Her mother, Vicki Delien, told talk show host Jeff Probst that her daughter has slept anywhere from 32 to 64 days in a row.

Medications help spread her episodes apart. But one year, Delien fell into a somnambulant state just before Thanksgiving and didn't wake up until after Christmas, according to the New York Daily News.

"She's never really adjusted to it," Vicki Delien told the Chartiers Valley Patch. "She's 17 now and it really upsets her. She's missed out on a lot."

It took 25 months for doctors to diagnose Delien with the disorder, which affects just 1,000 people worldwide, according to the Kleine-Levin Syndrome Foundation website.

Affected people may go weeks, months or even years without any symptoms, and they then reappear without warning.